Leigh D4R Pro - Page 40

VARIABLY SPACED HALF-BLIND DOVETAILS
32
Chapter 10 D4R Pro User Guide
➀
Pins
h
➁
Pin sockets
➂
Half-pins
➃
Half-pin sockets
➄
Tails
H
➅
Tail Sockets
4
2
5
1
6
3
Depth of Cut
Depth of Cut
Tail Board
Pin Board
Bit selection is critical. You need to
select a specific dovetail bit for your
half-blind dovetail project, depending
on the pin board (drawer front) thick-
ness you are using.
• Choose one of the five
1
⁄2" [12,7mm]
diameter dovetail bits shown above.
Check bit selection in Appendix II.
• Depth of cut must be as specified
for each of the five bits illustrated
above. Note: Leigh bits 101-8, 112-8
and 128-8 are optional.
• Raising the bit above its specified
cutting depth will result in loose
joints and may damage the jig, bit
and/or guidebush. A lower setting
will result in tighter joints that may
not fit together.
• Small Depth of Cut adjustments
will change joint fit tightness. See
10-3 to 10-5 for why.
• Half-blind PINS and TAILS are
routed with the same dovetail bit
and must be at the same Depth of
Cut.
• The e7-eBush should be set at 10
for ALL half-blind dovetail rout-
ing.
• All half-blind dovetail bits work
with the Leigh e7-Bush supplied
with your Leigh jig, or standard
7
⁄16"[11,1mm] outside diameter
guidebush.
10-1 Half-Blind Dovetail Terminology:
The pins fit in the pin sockets. Joints should almost always end each
side with half-pins.
2
1
3
PIN BOARD THICKNESS
➀
determines
the maximum depth of cut
➁
you can
use. Select a bit with a specified cutting
depth that is at about
1
⁄8" [3mm] less than
the pin board thickness.
A dovetail bit will produce only one spe-
cific cutting depth.
Only
1
⁄2" [12,7mm]
➂
cutting diameter bits
can be used for half-blind dovetails.
10-2 Cutting Depth for Variably Spaced Half-Blind Dovetails
14 ˚
120-8
7
/ 16
"
[11mm]
12 ˚
112-8
1
/ 2
"
[13mm]
10 ˚
101-8
5
/ 8
"
[16mm]
128-8
3
/ 8
"
[9mm]
18 ˚
80-8
3
/ 4
"
[19mm]
DEPTH
OF CUT
DEPTH
OF CUT
IMPORTANT: Add
~
1
/ 8
"
[3mm] to the depth of cut for pin board thickness
NOTE: See10-35 chart on p.38 for range of tail board thickness
~ Symbol for approximately
Pin Board Thickness
Pin Board Thickness
~
~
~
~~
NOTE: Bits 120-8 and 80-8 are included with the jig
~
1
/ 8
"
[3mm] min.
~
1
/ 8
"
[3mm] min.
 Important! Read This About HB Depth of Cut